This function checks if the regular expression provided as the first argument is a valid regular expression. There are several reasons why a regular expression could be invalid. These include unbalanced capturing parentheses, referencing a captured group which is not actually captured etc. This function returns a real 1 if the regular expression is valid or a string with an error message. You can test the type of the return value with the IsStr function.
Note that you will only need to use this function for development or in a script where the regular expression is created during script execution. Any regular expression entered as a string literal can be checked before the script is executed using this function, and the actual script will not need to call this function.
| Number | Type | Compulsory | Default | Description |
| 1 | string | Yes | Regular expression |
The regular expression string.
Return type: real or string
If the expression is valid, the return is a real 1. If invalid, a string error message describing why the regular expression is not valid.
RegExisValid('asdfghjkl)')
returns 'Invalid regular expression (unmatched closing parenthesis) index into regular expression string where error occurs : 9'
An example of a missing closing parentheses:
RegExisValid('(asdfghjkl')
returns 'Invalid regular expression (missing closing parenthesis) index into regular expression string where error occurs : 10'
Once the opening and closing parentheses are correctly matched:
RegExisValid('(asdfghjkl)')
returns 1.
| ▲Function Summary▲ | ||
| ◄ RegExContains | RegExMatch ▶ | |